Daycore

Origin

From , coined by analogy with nightcore.

Full definition of daycore

Noun

1. (Internet slang, music) A style of music in which a song is slowed down and lowered in pitch.
   a daycore remix
• 21 December 2020, Cat Zhang, The Year in Music on TikTok 2020, Perhaps extending from their relative ubiquity on TikTok's predecessor Musical.ly, nightcore audios have a strong presence on the app; so do their opposites, "daycore" or "anti-nightcore" remixes, in which tracks are slowed down for a heady, sluggish effect.
• 3 June 2022, Allia Luzong, 7 Weirdly Specific YouTube Channels That Are Perfect for Procrastinating, If you've heard of the reverb + slowed trend, congrats, you've been listening to music on YouTube. The slowed trend is just one of many YouTube music trends, earlier versions of which include Nightcore and Daycore.